Rails: Nested resource and specifying the "nester" - ruby-on-rails-3

Question

A company has many properties. A property has one company.
In my routes file I got:
resources :companies do
resources :property_managers
end
In the property_manager_controller, my create action looks like this (default scaffold implementation slightly modified to accommodate the company):
def create
#property_manager = PropertyManager.new(params[:property_manager])
#property_manager.company_id = params[:company_id]
respond_to do |format|
if #property_manager.save
format.html { redirect_to company_property_managers_path, notice: 'Property manager was successfully created.' }
format.json { render json: #property_manager, status: :created, location: #property_manager }
else
format.html { render action: "new" }
format.json { render json: #property_manager.errors, status: :unprocessable_entity }
end
end
end
Is there a way in which I do not have to explicitly set the company_id, since it is known within the context of the URL/route?

Answer 1

I guess you could do something like the following, not sure if it's better or not:
class PropertyManagersController < ApplicationController
before_filter :find_company
def new
#property_manager = #company.property_managers.build
end
def create
#property_manager = #company.property_managers.build(params[:property_manager])
respond_to do |format|
...
end
end
private
def find_company
#company ||= Company.find(params[:company_id])
end
end